Buzzing IC's


Hi, I have an ARC LS25 mkII preamp and I've tried two different sets of the WBC Mogami 2549 shielded cables from Amazon. I'm using these between the preamp and my KEF KC62 subwoofer. They buzz when installed but when I throw on a pair of unshielded IC's no problems at all. Any idea what could be causing this? Thanks!

cetla416

Had a similar problem with an AV receiver. Was a ground loop issue. Are the subs and pre amp plugged into the same circuit?

I tried a pair of Tara Labs directional cable now. Same buzzing as with the WBC Cables. Unshielded cables no issue. I should lift the drain on the Tara's.

If your sub has a 3-prong AC plug, use a cheater, (3-prong to 2-prong adapter) to see if it breaks the ground loop.

Thanks! I thought that would be it. I tried a cheater plug on the subwoofer and the preamp. no difference. Crazy! I give up. 

Looks like the sub has a "ground lift" switch on it?  Does that matter if it's on or off?